摘要
针对微网内高密度分布式电源DG(distributed generation)输出功率波动引起的微网三相潮流不平衡及运行不稳定问题,研究了基于电力电子变压器PET(power electronic transformer)的微网相间潮流控制方法。推导了基于三相独立控制的PET输出级变流器数学模型,提出了分相改进下垂控制策略,可以协调微网内相间的功率交换,从而保证了各相分布式电源的最大利用率。同时,增加电压和频率修正环节快速调整功率波动时的电压和频率偏差,提高了微网运行的稳定性。PSCAD/EMTDC仿真证明了所提控制策略的正确性和有效性。
In view of three-phase power flow unbalance and instability caused by the fluctuation of high density distributed generation(DG) output power in the micro-grid, inter-phase power flow control method of micro-grid based on Power Electronic Transformer(PET) was studied. Mathematical model of PET output-side converter with three-phase independent control was deduced, and split phase improved droop control was proposed to coordinate micro-grid power exchange, which ensured the maximum utilization of DG in each phase. At the same time, the voltage and frequency deviation caused by power fluctuation were quickly adjusted through the voltage and frequency correction link, which improved the stability of the micro-grid operation. PSCAD/EMTDC simulation results have illustrated the correctness and effectiveness of the proposed control strategy.
出处
《电源学报》
CSCD
2016年第2期95-102,共8页
Journal of Power Supply
基金
国家自然科学基金资助项目(51577055)~~
关键词
微网
电力电子变压器
相间功率流动
下垂控制
micro-grid
power electronic transformer
inter-phase power flow
droop control
作者简介
涂春鸣(1976-),男,博士,教授,博士生导师,研究方向为新能源发电技术及电力电子在电力系统中的应用等,E-mail:chunming_tu@263.net。
杨晶晶(1988-),女,通信作者,硕士研究生,研究方向为电力电子技术在电力系统中的应用等,E-mail:yang473@163.com。
兰征(1985-),男,博士研究生,研究方向为新能源发电技术,电力电子技术在电力系统中的应用等.E-mail:lanzheng20@foxmail.com
刘维(1988-),男,硕士研究生,研究方向为先进电能质量优化控制.微网暂态稳定性分析等,E-mail:liuwei@126.com